Electronic apparatus and electronic system

Abstract

According to an embodiment, there is provided an electronic apparatus which operates under another electronic apparatus when the other electronic apparatus is controlled by a predetermined control instruction, including: a receiving unit, a switch, a microcomputer, and a power control unit. The receiving unit receives a power ON command. The microcomputer operates under control of the other electronic apparatus. The switch switches whether to supply external power to the microcomputer. The power control unit turns on the switch when the receiving unit receives the power ON command so that the microcomputer can be controlled by the other electronic apparatus.

1 . An electronic apparatus which operates under another electronic apparatus when the other electronic apparatus is controlled by a predetermined control instruction, comprising:
 a receiving unit configured to receive a power ON command;   a microcomputer configured to operate under control of the other electronic apparatus;   a switch configured to switch whether to supply power from an external power source to the microcomputer; and   a power control unit configured to turn on the switch when the receiving unit receives the power ON command so that the microcomputer can be controlled by the other electronic apparatus.   
     
     
         2 . The apparatus according to  claim 1 , wherein the receiving unit receives the power ON command from the other electronic apparatus. 
     
     
         3 . The apparatus according to  claim 2 , wherein the receiving unit receives the power ON command from a remote control device that controls the other electronic apparatus. 
     
     
         4 . An electronic system comprising:
 the electronic apparatus according to  claim 1 ; and   a remote control device for the other electronic apparatus, wherein   the remote control device includes an input unit that receives a control instruction for the other electronic apparatus from a user,   the remote control device transmits, when the control instruction is input to the input unit, the power ON command to the electronic apparatus and transmits a command corresponding to contents of the control instruction to the other electronic apparatus.   
     
     
         5 . The apparatus according to  claim 1 , further comprising:
 a main unit configured to provide a main function; and   another switch configured to switch whether to supply the power to the main unit,   wherein the microcomputer supplied with the power turns on the other switch to supply the power to the main unit.   
     
     
         6 . The apparatus according to  claim 2 , wherein the receiving unit receives the power ON command wirelessly or with infrared rays from the other electronic apparatus. 
     
     
         7 . The apparatus according to  claim 1 , wherein the receiving unit and the power control unit operate with power from a primary cell, a secondary cell, or a super capacitor, the power from the external power source being different from the power from the primary cell, the secondary cell, or the super capacitor. 
     
     
         8 . An electronic system comprising:
 the electronic apparatus according to  claim 1 ,   the other electronic apparatus according to  claim 1 , and   a remote control device, wherein   the other electronic apparatus includes:   a first receiving unit configured to receive the power ON command;   a first switch configured to switch whether to supply power from a first external power source to the first main unit;   a first main unit configured to provide a main function; and   a first microcomputer configured to receive a supply of the power from the first external power source to operate, and turn on the first switch when the first receiving unit receives the power ON command,   the remote control device transmits the power ON command to each of the electronic apparatus and the other electronic apparatus.   
     
     
         9 . The system according to  claim 8 , wherein the remote control device receives a control instruction or a power-on instruction for the other electronic apparatus, and transmits the power ON command to each of the electronic apparatus and the other electronic apparatus when the control instruction or the power-on instruction is Input to the remote control device. 
     
     
         10 . The system according to  claim 9 , wherein the remote control device first transmits the power ON command to the electronic apparatus, and transmits the power ON command to the other electronic apparatus a predetermined period of time after the transmission of the power ON command to the electronic apparatus, the predetermined period of time being determined in accordance with a rise time of the microcomputer of the electronic apparatus. 
     
     
         11 . The system according to  claim 8 , wherein
 the electronic apparatus includes:   a main unit configured to provide a main function; and   another switch configured to switch whether to supply the power from the external power source to the main unit,   wherein the microcomputer supplied with the power turns on the other switch.